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I'm guessing what you are asking is if they express their physical pain vocally?

I have killed many insects (although I do like spiders and snakes), and do not recall hearing them make sounds. I have noticed them squirming and writhing in a certain way that would suggest they are feeling pain.

I do not remember seeing a snake die ( I like to catch them and I do have some pet snakes). The only sounds I have ever heard them make were hissing and wheezing (if they had a respiratory infection).

I have seen snakes and spiders and other insects die, and they certainly squirm and it upsets me to see it happen....but as far as pain goes...I'm not sure. It sure looked like the snakes were in pain.

I rarely kill anything besides flies and mosquitoes, other things I prefer to relocate outside, though there are some spiders...much to my husbands disgust...that I allow to live in the house.

I always feel dreadful when I have to kill something, or when I see other people, even my husband, killing things.

They certainly suffer pain. They might not technically "weep", they don't have tear ducts, but they do endure pain.

I had the misfortune once of being in a laboratory where someone had been conducting experiments on arachnids. I won't describe them, because they're too disgusting, but the point of the experiment was to prove pain, and to record the levels of stress in the animals.

Interesting thing about spiders and flies. Brain cells have a kind of "scaffolding" which connects each brain cell to another, forming a net like pattern. In mammal's brain, that would include humans, our brain cells have only a few connections to other brain cells. That's why, comparatively speaking, our brains have to be larger than those of non mammals. Spiders, and insects have hundreds of connections radiating out from each brain cell, meaning that to all intents and purposes their brains are a hundred times more effective, for their size, than ours are. (Birds have a similar kind of structure... it makes up for how small the brain is, it's organized more effectively.) Obviously I'm not saying they're as clever as us, but they're certainly more sophisticated than sheer size would make us think.

A scientist in the nineteenth century came out against vivisection after he'd attempted to preserve a spider and her eggs in ethenol. In order not to distress the mother spider by killing her eggs first, he put her in the preservative first. A few hours later he put the eggs in. The "dead" mother promptly swam to the eggs and gathered them into her. That apparently shocked him. The spider had been alive and presumably conscious for a period of hours, and the first thing she thought was to protect her young.

I answered in the question above that yes they "cry." That was a bit simplistic. Obviously they don't cry.

Spiders don't vocalise... they breath very differently from us, and they don't have anything resembling a voice box. When they communicate with each other, they do so through means of scent and vibration (along webs and things) as though using morse code. But they don't utter noises that we would hear.

So they don't scream, they don't cry. They communicate through chemical scents, and vibrations that they pick up through their feet and exoskeletons.